Background: I use a derived class CListBox realize the host (owner

代码说明：

背景：我用一个CListBox派生类实现宿主（owner-draw）列表框，这个列表框的项目宽度超过了列表框本身的宽度，因此当鼠标指针指向大宽度的列表框项时，我想显示一个类似Toolbar的提示窗口，在窗口中显示完整的列表框项目文本... -Background: I use a derived class CListBox realize the host (owner-draw) list box, the list box the width of the project exceeds the width of the list box itself, so when the mouse pointer point to large width of the list box, I would like to show a similar Toolbar prompt window, the window to display the complete text of the list box item ...